path: root/mail/em-folder-tree-model.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2003 Ximian, Inc. (www.ximian.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <e-util/e-mktemp.h>

#include <camel/camel-file-utils.h>

#include "mail-config.h"
#include "mail-session.h"
#include "mail-tools.h"

#include "em-utils.h"

#include "em-marshal.h"
#include "em-folder-tree-model.h"


#define d(x) x

static GType col_types[] = {
    G_TYPE_STRING,   /* display name */
    G_TYPE_POINTER,  /* store object */
    G_TYPE_STRING,   /* path */
    G_TYPE_STRING,   /* uri */
    G_TYPE_UINT,     /* unread count */
    G_TYPE_BOOLEAN,  /* is a store node */
    G_TYPE_BOOLEAN,  /* has not-yet-loaded subfolders */
};


/* GObject virtual method overrides */
static void em_folder_tree_model_class_init (EMFolderTreeModelClass *klass);
static void em_folder_tree_model_init (EMFolderTreeModel *model);
static void em_folder_tree_model_finalize (GObject *obj);

/* interface init methods */
static void tree_model_iface_init (GtkTreeModelIface *iface);
static void tree_drag_dest_iface_init (GtkTreeDragDestIface *iface);
static void tree_drag_source_iface_init (GtkTreeDragSourceIface *iface);

/* drag & drop iface methods */
static gboolean model_drag_data_received (GtkTreeDragDest *drag_dest,
                      GtkTreePath *dest_path,
                      GtkSelectionData *selection);
static gboolean model_row_drop_possible  (GtkTreeDragDest *drag_dest,
                      GtkTreePath *dest_path,
                      GtkSelectionData *selection);
static gboolean model_row_draggable      (GtkTreeDragSource *drag_source,
                      GtkTreePath *src_path);
static gboolean model_drag_data_get      (GtkTreeDragSource *drag_source,
                      GtkTreePath *src_path,
                      GtkSelectionData *selection);
static gboolean model_drag_data_delete   (GtkTreeDragSource *drag_source,
                      GtkTreePath *src_path);


enum {
    LOADING_ROW,
    DRAG_DATA_RECEIVED,
    ROW_DROP_POSSIBLE,
    ROW_DRAGGABLE,
    DRAG_DATA_GET,
    DRAG_DATA_DELETE,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0, };


static GtkTreeStore *parent_class = NULL;


GType
em_folder_tree_model_get_type (void)
{
    static GType type = 0;
    
    if (!type) {
        static const GTypeInfo info = {
            sizeof (EMFolderTreeModelClass),
            NULL, /* base_class_init */
            NULL, /* base_class_finalize */
            (GClassInitFunc) em_folder_tree_model_class_init,
            NULL, /* class_finalize */
            NULL, /* class_data */
            sizeof (EMFolderTreeModel),
            0,    /* n_preallocs */
            (GInstanceInitFunc) em_folder_tree_model_init,
        };
        static const GInterfaceInfo tree_model_info = {
            (GInterfaceInitFunc) tree_model_iface_init,
            NULL,
            NULL
        };
        static const GInterfaceInfo drag_dest_info = {
            (GInterfaceInitFunc) tree_drag_dest_iface_init,
            NULL,
            NULL
        };
        static const GInterfaceInfo drag_source_info = {
            (GInterfaceInitFunc) tree_drag_source_iface_init,
            NULL,
            NULL
        };
        
        type = g_type_register_static (GTK_TYPE_TREE_STORE, "EMFolderTreeModel", &info, 0);
        
        g_type_add_interface_static (type, GTK_TYPE_TREE_MODEL,
                         &tree_model_info);
        g_type_add_interface_static (type, GTK_TYPE_TREE_DRAG_DEST,
                         &drag_dest_info);
        g_type_add_interface_static (type, GTK_TYPE_TREE_DRAG_SOURCE,
                         &drag_source_info);
    }
    
    return type;
}


static void
em_folder_tree_model_class_init (EMFolderTreeModelClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);
    
    parent_class = g_type_class_ref (GTK_TYPE_TREE_STORE);
    
    object_class->finalize = em_folder_tree_model_finalize;
    
    /* signals */
    signals[LOADING_ROW] =
        g_signal_new ("loading-row",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EMFolderTreeModelClass, loading_row),
                  NULL, NULL,
                  em_marshal_VOID__POINTER_POINTER,
                  G_TYPE_NONE, 2,
                  G_TYPE_POINTER,
                  G_TYPE_POINTER);
}

static void
em_folder_tree_model_init (EMFolderTreeModel *model)
{
    model->store_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
    model->uri_hash = g_hash_table_new (g_str_hash, g_str_equal);
    model->expanded = g_hash_table_new (g_str_hash, g_str_equal);
}

static void
path_hash_free (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    gtk_tree_row_reference_free (value);
}

static void
store_info_free (struct _EMFolderTreeModelStoreInfo *si)
{
    camel_object_remove_event (si->store, si->created_id);
    camel_object_remove_event (si->store, si->deleted_id);
    camel_object_remove_event (si->store, si->renamed_id);
    camel_object_remove_event (si->store, si->subscribed_id);
    camel_object_remove_event (si->store, si->unsubscribed_id);
    
    g_free (si->display_name);
    camel_object_unref (si->store);
    gtk_tree_row_reference_free (si->row);
    g_hash_table_foreach (si->path_hash, path_hash_free, NULL);
    g_free (si);
}

static void
store_hash_free (gpointer key, gpointer value, gpointer user_data)
{
    struct _EMFolderTreeModelStoreInfo *si = value;
    
    store_info_free (si);
}

static void
uri_hash_free (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    gtk_tree_row_reference_free (value);
}

static gboolean
expanded_free (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    return TRUE;
}

static void
em_folder_tree_model_finalize (GObject *obj)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) obj;
    
    g_hash_table_foreach (model->store_hash, store_hash_free, NULL);
    g_hash_table_destroy (model->store_hash);
    
    g_hash_table_foreach (model->uri_hash, uri_hash_free, NULL);
    g_hash_table_destroy (model->uri_hash);
    
    g_hash_table_foreach (model->expanded, (GHFunc) expanded_free, NULL);
    g_hash_table_destroy (model->expanded);
    
    g_free (model->filename);
    
    G_OBJECT_CLASS (parent_class)->finalize (obj);
}


static void
tree_model_iface_init (GtkTreeModelIface *iface)
{
    ;
}

static void
tree_drag_dest_iface_init (GtkTreeDragDestIface *iface)
{
    iface->drag_data_received = model_drag_data_received;
    iface->row_drop_possible = model_row_drop_possible;
}

static void
tree_drag_source_iface_init (GtkTreeDragSourceIface *iface)
{
    iface->row_draggable = model_row_draggable;
    iface->drag_data_get = model_drag_data_get;
    iface->drag_data_delete = model_drag_data_delete;
}


static void
drop_uid_list (CamelFolder *dest, gboolean move, GtkSelectionData *selection, CamelException *ex)
{
    CamelFolder *src;
    GPtrArray *uids;
    char *src_uri;
    
    em_utils_selection_get_uidlist (selection, &src_uri, &uids);
    
    if (!(src = mail_tool_uri_to_folder (src_uri, 0, ex))) {
        em_utils_uids_free (uids);
        g_free (src_uri);
        return;
    }
    
    g_free (src_uri);
    
    camel_folder_transfer_messages_to (src, uids, dest, NULL, move, ex);
    em_utils_uids_free (uids);
    camel_object_unref (src);
}

static void
drop_folder (CamelFolder *dest, gboolean move, GtkSelectionData *selection, CamelException *ex)
{
    CamelFolder *src;
    
    /* get the folder being dragged */
    if (!(src = mail_tool_uri_to_folder (selection->data, 0, ex)))
        return;
    
    if (src->parent_store == dest->parent_store && move) {
        /* simple rename() action */
        char *old_name, *new_name;
        
        old_name = g_strdup (src->full_name);
        new_name = g_strdup_printf ("%s/%s", dest->full_name, src->name);
        
        camel_store_rename_folder (dest->parent_store, old_name, new_name, ex);
        
        g_free (old_name);
        g_free (new_name);
    } else {
        /* copy the folder to the new location */
        CamelFolder *folder;
        char *path;
        
        path = g_strdup_printf ("%s/%s", dest->full_name, src->name);
        if ((folder = camel_store_get_folder (dest->parent_store, path, CAMEL_STORE_FOLDER_CREATE, ex))) {
            GPtrArray *uids;
            
            uids = camel_folder_get_uids (src);
            camel_folder_transfer_messages_to (src, uids, folder, NULL, FALSE, ex);
            camel_folder_free_uids (src, uids);
            
            camel_object_unref (folder);
        }
        
        g_free (path);
    }
    
    camel_object_unref (src);
}

static gboolean
import_message_rfc822 (CamelFolder *dest, CamelStream *stream, gboolean scan_from, CamelException *ex)
{
    CamelMimeParser *mp;
    
    mp = camel_mime_parser_new ();
    camel_mime_parser_scan_from (mp, scan_from);
    camel_mime_parser_init_with_stream (mp, stream);
    
    while (camel_mime_parser_step (mp, 0, 0) == CAMEL_MIME_PARSER_STATE_FROM) {
        CamelMessageInfo *info;
        CamelMimeMessage *msg;
        
        msg = camel_mime_message_new ();
        if (camel_mime_part_construct_from_parser (CAMEL_MIME_PART (msg), mp) == -1) {
            camel_object_unref (msg);
            camel_object_unref (mp);
            return FALSE;
        }
        
        /* append the message to the folder... */
        info = g_new0 (CamelMessageInfo, 1);
        camel_folder_append_message (dest, msg, info, NULL, ex);
        camel_object_unref (msg);
        
        if (camel_exception_is_set (ex)) {
            camel_object_unref (mp);
            return FALSE;
        }
        
        /* skip over the FROM_END state */
        camel_mime_parser_step (mp, 0, 0);
    }
    
    camel_object_unref (mp);
    
    return TRUE;
}

static void
drop_message_rfc822 (CamelFolder *dest, GtkSelectionData *selection, CamelException *ex)
{
    CamelStream *stream;
    gboolean scan_from;
    
    scan_from = selection->length > 5 && !strncmp (selection->data, "From ", 5);
    stream = camel_stream_mem_new_with_buffer (selection->data, selection->length);
    
    import_message_rfc822 (dest, stream, scan_from, ex);
    
    camel_object_unref (stream);
}

static void
drop_text_uri_list (CamelFolder *dest, GtkSelectionData *selection, CamelException *ex)
{
    char **urls, *url, *tmp;
    CamelStream *stream;
    CamelURL *uri;
    int fd, i;
    
    tmp = g_strndup (selection->data, selection->length);
    urls = g_strsplit (tmp, "\n", 0);
    g_free (tmp);
    
    for (i = 0; urls[i] != NULL; i++) {
        /* get the path component */
        url = g_strstrip (urls[i]);
        uri = camel_url_new (url, NULL);
        g_free (url);
        
        if (!uri || strcmp (uri->protocol, "file") != 0) {
            camel_url_free (uri);
            continue;
        }
        
        url = uri->path;
        uri->path = NULL;
        camel_url_free (uri);
        
        if ((fd = open (url, O_RDONLY)) == -1) {
            g_free (url);
            continue;
        }
        
        stream = camel_stream_fs_new_with_fd (fd);
        if (!import_message_rfc822 (dest, stream, TRUE, ex)) {
            /* FIXME: should we abort now? or continue? */
            /* for now lets just continue... */
            camel_exception_clear (ex);
        }
        
        camel_object_unref (stream);
        g_free (url);
    }
    
    g_free (urls);
}


static gboolean
model_drag_data_received (GtkTreeDragDest *drag_dest, GtkTreePath *dest_path, GtkSelectionData *selection)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) drag_dest;
    const char *full_name;
    CamelFolder *folder;
    CamelStore *store;
    CamelException ex;
    GtkTreeIter iter;
    char *path;
    
    /* this means we are receiving no data */
    if (!selection->data || selection->length == -1)
        return FALSE;
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, dest_path))
        return FALSE;
    
    gtk_tree_model_get ((GtkTreeModel *) model, &iter,
                COL_POINTER_CAMEL_STORE, &store,
                COL_STRING_FOLDER_PATH, &path, -1);
    
    /* make sure user isn't try to drop on a placeholder row */
    if (path == NULL)
        return FALSE;
    
    full_name = path[0] == '/' ? path + 1 : path;
    
    camel_exception_init (&ex);
    if ((folder = camel_store_get_folder (store, full_name, 0, &ex))) {
        /* FIXME: would have been nicer if we could 'move'
         * messages and/or folders. but alas, gtktreeview
         * drag&drop doesn't give us the context->action to
         * check for GDK_ACTION_MOVE, so we can't. Yay. */
        gboolean move = FALSE;
        
        if (selection->target == gdk_atom_intern ("x-uid-list", FALSE)) {
            /* import a list of uids from another evo folder */
            drop_uid_list (folder, move, selection, &ex);
            d(printf ("* dropped a x-uid-list\n"));
        } else if (selection->target == gdk_atom_intern ("x-folder", FALSE)) {
            /* copy or move (aka rename) a folder */
            drop_folder (folder, move, selection, &ex);
            d(printf ("* dropped a x-folder\n"));
        } else if (selection->target == gdk_atom_intern ("message/rfc822", FALSE)) {
            /* import a message/rfc822 stream */
            drop_message_rfc822 (folder, selection, &ex);
            d(printf ("* dropped a message/rfc822\n"));
        } else if (selection->target == gdk_atom_intern ("text/uri-list", FALSE)) {
            /* import an mbox, maildir, or mh folder? */
            drop_text_uri_list (folder, selection, &ex);
            d(printf ("* dropped a text/uri-list\n"));
        } else {
            g_assert_not_reached ();
        }
    }
    
    if (camel_exception_is_set (&ex)) {
        /* FIXME: error dialog? */
        camel_exception_clear (&ex);
        return FALSE;
    }
    
    return TRUE;
}

static gboolean
model_row_drop_possible (GtkTreeDragDest *drag_dest, GtkTreePath *dest_path, GtkSelectionData *selection)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) drag_dest;
    gboolean is_store;
    GtkTreeIter iter;
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, dest_path))
        return FALSE;
    
    gtk_tree_model_get ((GtkTreeModel *) model, &iter, COL_BOOL_IS_STORE, &is_store, -1);
    
    if (selection->target == gdk_atom_intern ("x-uid-list", FALSE)) {
        if (is_store)
            return FALSE;
        
        return TRUE;
    } else if (selection->target == gdk_atom_intern ("x-folder", FALSE)) {
        return TRUE;
    } else if (selection->target == gdk_atom_intern ("message/rfc822", FALSE)) {
        if (is_store)
            return FALSE;
        
        return TRUE;
    } else if (selection->target == gdk_atom_intern ("text/uri-list", FALSE)) {
        if (is_store)
            return FALSE;
        
        return TRUE;
    } else {
        g_assert_not_reached ();
        return FALSE;
    }
}

static gboolean
model_row_draggable (GtkTreeDragSource *drag_source, GtkTreePath *src_path)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) drag_source;
    gboolean is_store;
    GtkTreeIter iter;
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, src_path))
        return FALSE;
    
    gtk_tree_model_get ((GtkTreeModel *) model, &iter, COL_BOOL_IS_STORE, &is_store, -1);
    
    return !is_store;
}

static void
drag_text_uri_list (CamelFolder *src, GtkSelectionData *selection, CamelException *ex)
{
    CamelFolder *dest;
    const char *tmpdir;
    CamelStore *store;
    GPtrArray *uids;
    GString *url;
    
    if (!(tmpdir = e_mkdtemp ("drag-n-drop-XXXXXX"))) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create temporary directory: %s"),
                      g_strerror (errno));
        return;
    }
    
    url = g_string_new ("mbox:");
    g_string_append (url, tmpdir);
    if (!(store = camel_session_get_store (session, url->str, ex))) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create temporary mbox store: %s"),
                      camel_exception_get_description (ex));
        g_string_free (url, TRUE);
        
        return;
    }
    
    if (!(dest = camel_store_get_folder (store, "mbox", CAMEL_STORE_FOLDER_CREATE, ex))) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create temporary mbox folder: %s"),
                      camel_exception_get_description (ex));
        
        camel_object_unref (store);
        g_string_free (url, TRUE);
        
        return;
    }
    
    camel_object_unref (store);
    uids = camel_folder_get_uids (src);
    
    camel_folder_transfer_messages_to (src, uids, dest, NULL, FALSE, ex);
    if (camel_exception_is_set (ex)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not copy messages to temporary mbox folder: %s"),
                      camel_exception_get_description (ex));
    } else {
        /* replace "mbox:" with "file:" */
        memcpy (url->str, "file", 4);
        g_string_append (url, "\r\n");
        gtk_selection_data_set (selection, selection->target, 8, url->str, url->len);
    }
    
    camel_folder_free_uids (src, uids);
    camel_object_unref (dest);
    g_string_free (url, TRUE);
}

static gboolean
model_drag_data_get (GtkTreeDragSource *drag_source, GtkTreePath *src_path, GtkSelectionData *selection)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) drag_source;
    const char *full_name;
    CamelFolder *folder;
    CamelStore *store;
    CamelException ex;
    GtkTreeIter iter;
    char *path, *uri;
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, src_path))
        return FALSE;
    
    gtk_tree_model_get ((GtkTreeModel *) model, &iter,
                COL_POINTER_CAMEL_STORE, &store,
                COL_STRING_FOLDER_PATH, &path,
                COL_STRING_URI, &uri, -1);
    
    /* make sure user isn't try to drag on a placeholder row */
    if (path == NULL)
        return FALSE;
    
    full_name = path[0] == '/' ? path + 1 : path;
    
    camel_exception_init (&ex);
    
    if (selection->target == gdk_atom_intern ("x-folder", FALSE)) {
        /* dragging to a new location in the folder tree */
        gtk_selection_data_set (selection, selection->target, 8, uri, strlen (uri) + 1);
    } else if (selection->target == gdk_atom_intern ("text/uri-list", FALSE)) {
        /* dragging to nautilus or something, probably */
        if ((folder = camel_store_get_folder (store, full_name, 0, &ex))) {
            drag_text_uri_list (folder, selection, &ex);
            camel_object_unref (folder);
        }
    } else {
        g_assert_not_reached ();
    }
    
    if (camel_exception_is_set (&ex)) {
        /* FIXME: error dialog? */
        camel_exception_clear (&ex);
        return FALSE;
    }
    
    return TRUE;
}

static gboolean
model_drag_data_delete (GtkTreeDragSource *drag_source, GtkTreePath *src_path)
{
    EMFolderTreeModel *model = (EMFolderTreeModel *) drag_source;
    const char *full_name;
    gboolean is_store;
    CamelStore *store;
    CamelException ex;
    GtkTreeIter iter;
    char *path;
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, src_path))
        return FALSE;
    
    gtk_tree_model_get ((GtkTreeModel *) model, &iter,
                COL_POINTER_CAMEL_STORE, &store,
                COL_STRING_FOLDER_PATH, &path,
                COL_BOOL_IS_STORE, &is_store, -1);
    
    if (is_store)
        return FALSE;
    
    full_name = path[0] == '/' ? path + 1 : path;
    
    camel_exception_init (&ex);
    camel_store_delete_folder (store, full_name, &ex);
    if (camel_exception_is_set (&ex)) {
        /* FIXME: error dialog? */
        camel_exception_clear (&ex);
        return FALSE;
    }
    
    return TRUE;
}


static void
em_folder_tree_model_load_state (EMFolderTreeModel *model, const char *filename)
{
    char *node;
    FILE *fp;
    
    g_hash_table_foreach_remove (model->expanded, expanded_free, NULL);
    
    if ((fp = fopen (filename, "r")) == NULL)
        return;
    
    while (camel_file_util_decode_string (fp, &node) != -1)
        g_hash_table_insert (model->expanded, node, GINT_TO_POINTER (TRUE));
    
    fclose (fp);
}


EMFolderTreeModel *
em_folder_tree_model_new (const char *evolution_dir)
{
    EMFolderTreeModel *model;
    char *filename;
    
    model = g_object_new (EM_TYPE_FOLDER_TREE_MODEL, NULL);
    gtk_tree_store_set_column_types ((GtkTreeStore *) model, NUM_COLUMNS, col_types);
    
    filename = g_build_filename (evolution_dir, "mail", "config", "folder-tree.state", NULL);
    em_folder_tree_model_load_state (model, filename);
    model->filename = filename;
    
    return model;
}


void
em_folder_tree_model_set_folder_info (EMFolderTreeModel *model, GtkTreeIter *iter,
                      struct _EMFolderTreeModelStoreInfo *si,
                      CamelFolderInfo *fi)
{
    GtkTreeRowReference *uri_row, *path_row;
    unsigned int unread;
    GtkTreePath *path;
    GtkTreeIter sub;
    gboolean load;
    
    load = !fi->child && (fi->flags & CAMEL_FOLDER_CHILDREN) && !(fi->flags & CAMEL_FOLDER_NOINFERIORS);
    
    path = gtk_tree_model_get_path ((GtkTreeModel *) model, iter);
    uri_row = gtk_tree_row_reference_new ((GtkTreeModel *) model, path);
    path_row = gtk_tree_row_reference_copy (uri_row);
    gtk_tree_path_free (path);
    
    g_hash_table_insert (model->uri_hash, g_strdup (fi->url), uri_row);
    g_hash_table_insert (si->path_hash, g_strdup (fi->path), path_row);
    
    unread = fi->unread_message_count == -1 ? 0 : fi->unread_message_count;
    
    gtk_tree_store_set ((GtkTreeStore *) model, iter,
                COL_STRING_DISPLAY_NAME, fi->name,
                COL_POINTER_CAMEL_STORE, si->store,
                COL_STRING_FOLDER_PATH, fi->path,
                COL_STRING_URI, fi->url,
                COL_UINT_UNREAD, unread,
                COL_BOOL_IS_STORE, FALSE,
                COL_BOOL_LOAD_SUBDIRS, load,
                -1);
    
    if (fi->child) {
        fi = fi->child;
        
        do {
            gtk_tree_store_append ((GtkTreeStore *) model, &sub, iter);
            em_folder_tree_model_set_folder_info (model, &sub, si, fi);
            fi = fi->sibling;
        } while (fi);
    } else if (load) {
        /* create a placeholder node for our subfolders... */
        gtk_tree_store_append ((GtkTreeStore *) model, &sub, iter);
        gtk_tree_store_set ((GtkTreeStore *) model, &sub,
                    COL_STRING_DISPLAY_NAME, _("Loading..."),
                    COL_POINTER_CAMEL_STORE, NULL,
                    COL_STRING_FOLDER_PATH, NULL,
                    COL_BOOL_LOAD_SUBDIRS, FALSE,
                    COL_BOOL_IS_STORE, FALSE,
                    COL_STRING_URI, NULL,
                    COL_UINT_UNREAD, 0,
                    -1);
        
        path = gtk_tree_model_get_path ((GtkTreeModel *) model, iter);
        g_signal_emit (model, signals[LOADING_ROW], 0, path, iter);
        gtk_tree_path_free (path);
    }
}


static void
folder_subscribed_cb (CamelStore *store, void *event_data, EMFolderTreeModel *model)
{
    struct _EMFolderTreeModelStoreInfo *si;
    CamelFolderInfo *fi = event_data;
    GtkTreeRowReference *row;
    GtkTreeIter parent, iter;
    GtkTreePath *path;
    gboolean load;
    char *dirname;
    
    if (!(si = g_hash_table_lookup (model->store_hash, store)))
        return;
    
    /* make sure we don't already know about it? */
    if (g_hash_table_lookup (si->path_hash, fi->path))
        return;
    
    /* get our parent folder's path */
    if (!(dirname = g_path_get_dirname (fi->path)))
        return;
    
    if (!strcmp (dirname, "/")) {
        /* user subscribed to a toplevel folder */
        row = si->row;
        g_free (dirname);
    } else {
        row = g_hash_table_lookup (si->path_hash, dirname);
        g_free (dirname);
        
        /* if row is NULL, don't bother adding to the tree,
         * when the user expands enough nodes - it will be
         * added auto-magically */
        if (row == NULL)
            return;
    }
    
    path = gtk_tree_row_reference_get_path (row);
    if (!(gtk_tree_model_get_iter ((GtkTreeModel *) model, &parent, path))) {
        gtk_tree_path_free (path);
        return;
    }
    
    gtk_tree_path_free (path);
    
    /* make sure parent's subfolders have already been loaded */
    gtk_tree_model_get ((GtkTreeModel *) model, &parent, COL_BOOL_LOAD_SUBDIRS, &load, -1);
    if (load)
        return;
    
    /* append a new node */
    gtk_tree_store_append ((GtkTreeStore *) model, &iter, &parent);
    
    em_folder_tree_model_set_folder_info (model, &iter, si, fi);
}

static void
folder_unsubscribed_cb (CamelStore *store, void *event_data, EMFolderTreeModel *model)
{
    struct _EMFolderTreeModelStoreInfo *si;
    CamelFolderInfo *fi = event_data;
    GtkTreeRowReference *row;
    GtkTreePath *path;
    GtkTreeIter iter;
    
    if (!(si = g_hash_table_lookup (model->store_hash, store)))
        return;
    
    if (!(row = g_hash_table_lookup (si->path_hash, fi->path)))
        return;
    
    path = gtk_tree_row_reference_get_path (row);
    if (!(gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, path))) {
        gtk_tree_path_free (path);
        return;
    }
    
    em_folder_tree_model_remove_folders (model, si, &iter);
}

static void
folder_created_cb (CamelStore *store, void *event_data, EMFolderTreeModel *model)
{
    /* we only want created events to do more work if we don't support subscriptions */
    if (!camel_store_supports_subscriptions (store))
        folder_subscribed_cb (store, event_data, model);
}

static void
folder_deleted_cb (CamelStore *store, void *event_data, EMFolderTreeModel *model)
{
    /* we only want deleted events to do more work if we don't support subscriptions */
    if (!camel_store_supports_subscriptions (store))
        folder_unsubscribed_cb (store, event_data, model);
}

static void
folder_renamed_cb (CamelStore *store, void *event_data, EMFolderTreeModel *model)
{
    struct _EMFolderTreeModelStoreInfo *si;
    CamelRenameInfo *info = event_data;
    GtkTreeRowReference *row;
    GtkTreeIter root, iter;
    GtkTreePath *path;
    char *parent, *p;
    
    if (!(si = g_hash_table_lookup (model->store_hash, store)))
        return;
    
    parent = g_strdup_printf ("/%s", info->old_base);
    if (!(row = g_hash_table_lookup (si->path_hash, parent))) {
        g_free (parent);
        return;
    }
    g_free (parent);
    
    path = gtk_tree_row_reference_get_path (row);
    if (!(gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, path))) {
        gtk_tree_path_free (path);
        return;
    }
    
    em_folder_tree_model_remove_folders (model, si, &iter);
    
    parent = g_strdup (info->new->path);
    if ((p = strrchr (parent + 1, '/')))
        *p = '\0';
    
    if (!strcmp (parent, "/")) {
        /* renamed to a toplevel folder on the store */
        path = gtk_tree_row_reference_get_path (si->row);
    } else {
        if (!(row = g_hash_table_lookup (si->path_hash, parent))) {
            /* NOTE: this should never happen, but I
             * suppose if it does in reality, we can add
             * code here to add the missing nodes to the
             * tree */
            g_assert_not_reached ();
            g_free (parent);
            return;
        }
        
        path = gtk_tree_row_reference_get_path (row);
    }
    
    g_free (parent);
    
    if (!gtk_tree_model_get_iter ((GtkTreeModel *) model, &root, path)) {
        gtk_tree_path_free (path);
        g_assert_not_reached ();
        return;
    }
    
    gtk_tree_store_append ((GtkTreeStore *) model, &iter, &root);
    em_folder_tree_model_set_folder_info (model, &iter, si, info->new);
}


void
em_folder_tree_model_add_store (EMFolderTreeModel *model, CamelStore *store, const char *display_name)
{
    struct _EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *row;
    GtkTreeIter root, iter;
    GtkTreePath *path;
    char *uri;
    
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));
    g_return_if_fail (display_name != NULL);
    
    if ((si = g_hash_table_lookup (model->store_hash, store))) {
        const char *name;
        
        path = gtk_tree_row_reference_get_path (si->row);
        gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, path);
        gtk_tree_path_free (path);
        
        gtk_tree_model_get ((GtkTreeModel *) model, &iter, COL_STRING_DISPLAY_NAME, (char **) &name, -1);
        
        g_warning ("the store `%s' is already in the folder tree as `%s'",
               display_name, name);
        
        return;
    }
    
    uri = camel_url_to_string (((CamelService *) store)->url, CAMEL_URL_HIDE_ALL);
    
    /* add the store to the tree */
    gtk_tree_store_append ((GtkTreeStore *) model, &iter, NULL);
    gtk_tree_store_set ((GtkTreeStore *) model, &iter,
                COL_STRING_DISPLAY_NAME, display_name,
                COL_POINTER_CAMEL_STORE, store,
                COL_STRING_FOLDER_PATH, "/",
                COL_BOOL_LOAD_SUBDIRS, TRUE,
                COL_BOOL_IS_STORE, TRUE,
                COL_STRING_URI, uri, -1);
    
    path = gtk_tree_model_get_path ((GtkTreeModel *) model, &iter);
    row = gtk_tree_row_reference_new ((GtkTreeModel *) model, path);
    gtk_tree_path_free (path);
    
    si = g_new (struct _EMFolderTreeModelStoreInfo, 1);
    si->display_name = g_strdup (display_name);
    camel_object_ref (store);
    si->store = store;
    si->row = row;
    si->path_hash = g_hash_table_new (g_str_hash, g_str_equal);
    g_hash_table_insert (model->store_hash, store, si);
    
    /* each store has folders... but we don't load them until the user demands them */
    root = iter;
    gtk_tree_store_append ((GtkTreeStore *) model, &iter, &root);
    gtk_tree_store_set ((GtkTreeStore *) model, &iter,
                COL_STRING_DISPLAY_NAME, _("Loading..."),
                COL_POINTER_CAMEL_STORE, NULL,
                COL_STRING_FOLDER_PATH, NULL,
                COL_BOOL_LOAD_SUBDIRS, FALSE,
                COL_BOOL_IS_STORE, FALSE,
                COL_STRING_URI, NULL,
                COL_UINT_UNREAD, 0,
                -1);
    
    g_free (uri);
    
    /* listen to store events */
#define CAMEL_CALLBACK(func) ((CamelObjectEventHookFunc) func)
    si->created_id = camel_object_hook_event (store, "folder_created", CAMEL_CALLBACK (folder_created_cb), model);
    si->deleted_id = camel_object_hook_event (store, "folder_deleted", CAMEL_CALLBACK (folder_deleted_cb), model);
    si->renamed_id = camel_object_hook_event (store, "folder_renamed", CAMEL_CALLBACK (folder_renamed_cb), model);
    si->subscribed_id = camel_object_hook_event (store, "folder_subscribed", CAMEL_CALLBACK (folder_subscribed_cb), model);
    si->unsubscribed_id = camel_object_hook_event (store, "folder_unsubscribed", CAMEL_CALLBACK (folder_unsubscribed_cb), model);
}


static void
em_folder_tree_model_remove_uri (EMFolderTreeModel *model, const char *uri)
{
    GtkTreeRowReference *row;
    
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (uri != NULL);
    
    if ((row = g_hash_table_lookup (model->uri_hash, uri))) {
        g_hash_table_remove (model->uri_hash, uri);
        gtk_tree_row_reference_free (row);
    }
}


static void
em_folder_tree_model_remove_store_info (EMFolderTreeModel *model, CamelStore *store)
{
    struct _EMFolderTreeModelStoreInfo *si;
    
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));
    
    if (!(si = g_hash_table_lookup (model->store_hash, store)))
        return;
    
    g_hash_table_remove (model->store_hash, si->store);
    store_info_free (si);
}


void
em_folder_tree_model_remove_folders (EMFolderTreeModel *model, struct _EMFolderTreeModelStoreInfo *si, GtkTreeIter *toplevel)
{
    GtkTreeRowReference *row;
    char *uri, *folder_path;
    gboolean is_store, go;
    GtkTreeIter iter;
    
    if (gtk_tree_model_iter_children ((GtkTreeModel *) model, &iter, toplevel)) {
        do {
            GtkTreeIter next = iter;
            
            go = gtk_tree_model_iter_next ((GtkTreeModel *) model, &next);
            em_folder_tree_model_remove_folders (model, si, &iter);
            iter = next;
        } while (go);
    }
    
    gtk_tree_model_get ((GtkTreeModel *) model, toplevel, COL_STRING_URI, &uri,
                COL_STRING_FOLDER_PATH, &folder_path,
                COL_BOOL_IS_STORE, &is_store, -1);
    
    if (folder_path && (row = g_hash_table_lookup (si->path_hash, folder_path))) {
        g_hash_table_remove (si->path_hash, folder_path);
        gtk_tree_row_reference_free (row);
    }
    
    em_folder_tree_model_remove_uri (model, uri);
    
    gtk_tree_store_remove ((GtkTreeStore *) model, toplevel);
    
    if (is_store)
        em_folder_tree_model_remove_store_info (model, si->store);
}


void
em_folder_tree_model_remove_store (EMFolderTreeModel *model, CamelStore *store)
{
    struct _EMFolderTreeModelStoreInfo *si;
    GtkTreePath *path;
    GtkTreeIter iter;
    
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));
    
    if (!(si = g_hash_table_lookup (model->store_hash, store))) {
        g_warning ("the store `%s' is not in the folder tree", si->display_name);
        
        return;
    }
    
    path = gtk_tree_row_reference_get_path (si->row);
    gtk_tree_model_get_iter ((GtkTreeModel *) model, &iter, path);
    gtk_tree_path_free (path);
    
    /* recursively remove subfolders and finally the toplevel store */
    em_folder_tree_model_remove_folders (model, si, &iter);
}


gboolean
em_folder_tree_model_get_expanded (EMFolderTreeModel *model, const char *key)
{
    if (g_hash_table_lookup (model->expanded, key))
        return TRUE;
    
    return FALSE;
}


void
em_folder_tree_model_set_expanded (EMFolderTreeModel *model, const char *key, gboolean expanded)
{
    gpointer okey, oval;
    
    if (g_hash_table_lookup_extended (model->expanded, key, &okey, &oval)) {
        g_hash_table_remove (model->expanded, okey);
        g_free (okey);
    }
    
    if (expanded)
        g_hash_table_insert (model->expanded, g_strdup (key), GINT_TO_POINTER (TRUE));
}


static void
expanded_save (gpointer key, gpointer value, FILE *fp)
{
    /* FIXME: don't save stale entries */
    if (!GPOINTER_TO_INT (value))
        return;
    
    camel_file_util_encode_string (fp, key);
}

void
em_folder_tree_model_save_expanded (EMFolderTreeModel *model)
{
    char *dirname, *tmpname;
    FILE *fp;
    int fd;
    
    dirname = g_path_get_dirname (model->filename);
    if (camel_mkdir (dirname, 0777) == -1 && errno != EEXIST) {
        g_free (dirname);
        return;
    }
    
    g_free (dirname);
    tmpname = g_strdup_printf ("%s~", model->filename);
    
    if (!(fp = fopen (tmpname, "w+"))) {
        g_free (tmpname);
        return;
    }
    
    g_hash_table_foreach (model->expanded, (GHFunc) expanded_save, fp);
    
    if (fflush (fp) != 0)
        goto exception;
    
    if ((fd = fileno (fp)) == -1)
        goto exception;
    
    if (fsync (fd) == -1)
        goto exception;
    
    fclose (fp);
    fp = NULL;
    
    if (rename (tmpname, model->filename) == -1)
        goto exception;
    
    g_free (tmpname);
    
    return;
    
 exception:
    
    if (fp != NULL)
        fclose (fp);
    
    unlink (tmpname);
    g_free (tmpname);
}